$${\frac{{\mathtt{16}}}{{\mathtt{b}}}}{\mathtt{\,-\,}}{\mathtt{5}} = {\frac{{\mathtt{3}}}{{\mathtt{b}}}}{\mathtt{\,-\,}}{\frac{{\mathtt{2}}}{{\mathtt{b}}}}$$
possibles 3, 2, -3, -4
It is easier to solve an equation if it has no denominators, the denominator, b, can be eliminated by multiplying each term by 'b', resulting in:
16 - 5b = 3 - 2
16 - 5b = 1 Subtracting 16:
-5b = -15 Now, divide by -5.
